From the KOR website:
KOR Delta incorporates everything we've learned about the art of high-style, high-performance hydration. It's an on-the-go vessel with a confident personality and groundbreaking new features. The versatile Delta features an easy-to-open, push-button cap with ergonomic handle, KOR's "perfect spout," and new safety-latch for worry-free closure. The cap and bottle separate with a simple twist for easy cleaning.
I've got two of them two give away. I'll use random.org to pick two winners on January 1st. And this is all you have to to enter: